CVE-2009-4530 in Mongoose
Summary
by MITRE
Mongoose 2.8.0 and earlier allows remote attackers to obtain the source code for a web page by appending ::$DATA to the URI.
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Analysis
by VulDB Data Team • 08/30/2021
The vulnerability described in CVE-2009-4530 represents a critical information disclosure flaw within the Mongoose web server software version 2.8.0 and earlier. This issue arises from improper access control mechanisms that fail to validate user requests before serving sensitive content. The vulnerability specifically affects the web server's handling of URI requests and exposes a method by which attackers can bypass normal access restrictions to retrieve source code files. The flaw manifests when a malicious user appends the special sequence ::$DATA to any URI within the web server's scope, effectively triggering an unintended data retrieval mechanism.
The technical exploitation of this vulnerability stems from the Mongoose web server's insufficient input validation and access control implementation. When the web server processes a request containing the ::$DATA suffix, it fails to properly authenticate or authorize the requestor before attempting to serve the requested content. This behavior creates an information disclosure channel that allows remote attackers to access not only the source code of web pages but potentially other sensitive files stored on the server. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be leveraged by anyone with network access to the affected server.
From an operational perspective, this vulnerability poses significant risks to organizations hosting web applications on affected Mongoose servers. The exposure of source code files can reveal sensitive implementation details including database connection strings, API keys, application logic, and other confidential information that could be exploited by attackers to develop more sophisticated attacks. The impact extends beyond simple information disclosure as the leaked source code may contain hardcoded credentials, business logic, or architectural details that could be used for privilege escalation, lateral movement, or targeted attacks against the organization's infrastructure. Security professionals should note that this vulnerability aligns with CWE-200, which specifically addresses information disclosure vulnerabilities in software systems.
The exploitation of CVE-2009-4530 demonstrates a clear pattern of inadequate access control mechanisms that violate fundamental security principles. This vulnerability can be categorized under ATT&CK technique T1566, which covers social engineering attacks, as it represents an attack vector that can be used to gather intelligence for more sophisticated attacks. The flaw essentially creates a backdoor mechanism within the web server that bypasses normal security controls, making it particularly concerning for organizations that rely on Mongoose for hosting sensitive applications. Organizations should recognize that this vulnerability is not limited to simple source code disclosure but can potentially expose complete application architectures and implementation details.
Mitigation strategies for this vulnerability require immediate patching of affected Mongoose installations to version 2.8.1 or later, where the issue has been resolved through proper input validation and access control enforcement. System administrators should also implement network-level restrictions to limit access to the affected web server and consider implementing additional security controls such as web application firewalls that can detect and block requests containing the ::$DATA suffix. Organizations should conduct thorough security assessments to identify all instances of affected Mongoose versions and ensure proper access controls are implemented for all web server components. The vulnerability serves as a reminder of the importance of input validation and proper access control mechanisms in preventing unauthorized access to sensitive information within web applications.